SDL_HINT_VIDEO_X11_ENABLE_XSYNC_EXT(3)

NAME
SDL_HINT_VIDEO_X11_ENABLE_XSYNC_EXT - A variable controlling whether the X Synchronization Extension is enabled.

SYNOPSIS
#include <SDL3/SDL_hints.h>

#define SDL_HINT_VIDEO_X11_ENABLE_XSYNC_EXT "SDL_VIDEO_X11_ENABLE_XSYNC_EXT"

DESCRIPTION
If set, this can result in smoother window resizing when rendering using OpenGL, however, there are some conditions:

• It is only activated on windows created with the SDL_WINDOW_OPENGL flag (windows using an SDL OpenGL renderer have this automatically set).

• When activated, presentation must be done with SDL_GL_SwapWindow()

(SDL_RenderPresent() calls this internally for OpenGL renderers as well).

Enabling this and presenting via an external mechanism will result in sync requests not being acked, and hangs and other odd window behavior may result.

The variable can be set to the following values:

• "0": The X Synchronization Extension is disabled. (default)

• "1": The X Synchronization Extension is enabled.

This hint should be set before creating a window.

AVAILABILITY
This hint is available since SDL 3.4.10.